How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

How to: Toyota Corolla old model pre-2004 lost key programming using UPA USB EEPROM programmer and TM100. This car has 4C chip and can be made programming 93C56 EEPROM in Car ECU / ECM.

Step 1: Read EEPROM


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Disassemble ECU under the dashboard


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Open ECU box, locate EEPROM IC 93C56


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Desolder IC chip and solder it to UPA EEPROM 93CXX adapter using a hot gun


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Connect 93CXX adapter and UPA with laptop
Open UPA USB v1.3 programmer software


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

In EEPROM, select 93C56x16->Read->Save with any name

Step 2: Write Key 



			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

In TM100 transponder key programmer, select Key Maker->Toyota->Corolla->ECU->-2004 (93C560(4C))



			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Press Open Dump File, open saved EEPROM file read by UPA


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Select key position (from any of the 4 positions) to add new key
Press Write Key


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Save the new file created with any name (here we have used Key 1)


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Open Last saved file again to add another key at any pisition you like
Press Write Key


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Save new file again with some other name (here Key 2)


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Open last saved file to verify newly added keys

Step 3: Write data back
Go back to UPA software


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Open last saved file in TM100


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Select 93C56x16 and press Program to write new file to EEPROM


			How to Program Toyota Corolla Old Model 4C Chip Key via EEPROM

Solder EEPROM chip back to ECU
Reinstall ECU to vehicle
Test the new keys and start car.

Done.

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Program Toyota Corolla -2004 4C Lost Key with UPA & TM100